This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8193 |
| 3 | 1594324 |
| 4 | 67117057 |
| 5 | 1220703126 |
| 6 | 1088524711 |
| 7 | 96889010408 |
| 8 | 549822930945 |
| 9 | 2541867422653 |
| 10 | 5000610355659 |
| 11 | 34522712143932 |
| 12 | 26751583696117 |
| 13 | 302875106592254 |
| 14 | 99226457784093 |
| 15 | 648732096885608 |
| 16 | 4504149450301441 |
| 17 | 9904578032905938 |
| 18 | 6941839931265343 |
| 19 | 42052983462257060 |